<template >

 <div class="list" ref="wrapper">
     <div> 

     <div class="area">
     <div class="title border-topbottom"> 当前城市</div>
     <div class="button-list">
         <div class="button-wrapper">
             <div class="button">{{this.currentCity}}</div> 
         </div>
    </div>
     </div>

     <div class="area">
     <div class="title border-topbottom"> 热门城市</div>
     <div class="button-list">
         <div class="button-wrapper" v-for="item of hot" :key="item.id" @click="handleCityClick(item.name)">
             <div class="button">{{item.name}}</div> 
         </div>
    </div>
     </div>
     <div class="area" v-for="(item,key) of cities" :key="key" :ref="key"> 
     <div class="title border-topbottom"> {{key}}</div>
     <div class="item-list">
         <div class="item border-bottom" v-for="innerItem of item" :key="innerItem.id" 
         @click="handleCityClick(innerItem.name)"
         >{{innerItem.name}}</div>
      
     </div>
     </div>  


</div> 
 </div>
</template>
<script>
import Bscroll from 'better-scroll'
import {mapState , mapMutations } from 'vuex'
export default {
    name:'CityList',
    props: {
        hot: Array,
        cities: Object,
        letter: String
    },
    computed:{
        ...mapState({currentCity: 'city'})
    },
    methods:{
        handleCityClick( city ){
                //this.$store.commit ('changeCity',city)
                this.changeCity(city)
                 this.$router.push('/')
        },
        ...mapMutations(['changeCity'])
    }, 
    watch: {
      letter (){
          if(this.letter){
           //   console.log (this.$refs )  
              const element= this.$refs[this.letter][0]
              this.scroll.scrollToElement(element)
          }
      }  
    },
       mounted(){
        this.scroll= new Bscroll(this.$refs.wrapper)
    },
}
</script>
<style lang="stylus" scoped >
@import '~@/assets/style/varibles.styl'
    .border-topbottom
        &:before
            border-color: #ccc
        &:after
            border-color: #ccc
    .border-bottom
        &:before
            border-color: #ccc
.list
    overflow:hidden 
    position: absolute
    top: 1.58rem
    left:0
    right:0
    bottom:0
    .title
        line-height: .54rem
        background: #eee
        padding-left: .2rem
        color: #666 
        font-size: .26rem 
    .button-list
        overflow: hidden 
        padding: .1rem .6rem .1rem .1rem
        .button-wrapper
            float: left
            width: 33.33%
            .button
                padding: .1rem 0
                margin: .1rem 
                text-align:center
                border: .02rem solid #ccc
                border-radius : .06rem 
    .item-list
        .item
            line-height: .76rem
            padding-left : .2rem 

</style>
 